Fisher 1212-X Manuel utilisateur

1212-X

Operating Manual

One Knob Metal Detector

FISHER RESEARCH LABORATORY

CONTENTS

About Your 1212-X ................................................................... pg. 1

Setting Up .................................................................................. pg. 2

Control Functions ...................................................................... pg. 4

Discrimination Points ................................................................ pg. 5

Searching .................................................................................. pg. 7

Pinpointing ................................................................................ pg. 9

Recovery Tools .......................................................................... pg. 11

Target Recovery ....................................................................... pg. 11

Operating Tips .......................................................................... pg. 12

False Signals .............................................................................. pg. 13

Battery Replacement ............................................................... pg. 14

Maintenance ............................................................................ pg. 15

Treasure Hunter’s Code Of Ethics ............................................ pg. 15

Where To Use Your Metal Detector In The U.S. ...................... pg. 16

Speciﬁcations ........................................................................... pg. 17

ABOUT YOUR DETECTOR

Your 1212-X is more proof from Fisher Research Laboratory that

a good metal detector doesn’t have to be complicated and

expensive. No frills but a lot of performance features that really

count: automatic VLF- ground rejection, automatic tuning,

variable trash rejection, headphone jack, built-in speaker and a

deep-seeking lightweight 8 inch search coil. Best of all it does what

a metal detector is supposed to do—it ignores ground minerals

and trash as it detects valuable buried targets.

One knob operation. Just pick it up, set your trash rejection level

and start searching. No tuning, no meter, no gimmicks.

Performance. If you’ve tested other detectors in this price range,

you’re in for a pleasant surprise. In fact you may ﬁnd that your

1212-X goes deeper and ignores trash better than some detectors

costing much more.

State of the art. Engineered by the world’s oldest and proudest

name in metal detectors. Patented double derivative electronics

provide up to 30 hours of silent, no drift operation on a single 9

volt transistor battery.

Read this instruction manual from cover to cover and treat your

1212-X as you would any high quality precision instrument. Drop

us a line if you have any questions, comments, or exciting 1212-X

stories. In the meantime . . .

Happy Hunting!

Fisher Research Laboratory

SETTING UP

The 1212-X comes to you just about ready to use. The only

adjustment required is the angle of the stem. Take a look at

page 3 and familiarize yourself with the parts of the 1212-X

before proceeding.

1. Unpack your new 1212-X carefully. Save the

carton and inserts—they may come in handy for

future storage or shipment.

2. Note that the search coil cable is permanently

attached to the control housing. Be careful not to

put any undue strain on it.

3. Take a look inside the locknut on the upper

stem. Note the clear locking pad on the left-hand

side and loosen the locknut by rotating it fully

counterclockwise.

4. Slip the lower stem into the upper stem, tighten

and loosen the ﬁt by turning the locknut.

5. Adjust the stem length (using the locknut) and

the coil angle (using the nylon wing nut) so that the

search coil rests ﬂat on the ground about 6 inches

in front of, and slightly to the right of, your right foot

(to the left of your left foot for left handers.) Your

arm should be straight and relaxed with your grip

held loosely.

REMEMBER: THE LONGER THE SHAFT, THE MORE

YOU WILL HAVE TO BEND YOUR ELBOW AND THE

SOONER YOUR ARM WILL GET TIRED. THE 1212-X

IS BALANCED FOR COMFORTABLE SEARCHING IN

A TIGHT SEMICIRCLE AROUND THE FRONT OF THE

OPERATOR.

6. With the stem length properly adjusted, remove

the search coil from the lower stem (by removing

the Delrin bolt and wing nut). Wind the cable loosely

around the upper and lower stems and reinstall the

search coil.

CAUTION: MAKE SURE THE CABLE IS NOT PULLED

TIGHT AT THE CONTROL HOUSING AND THAT YOU

HAVE ENOUGH SLACK AT THE SEARCH COIL TO

ADJUST IT TO ANY ANGLE.

7. With the shaft length and coil angle

properly adjusted, you should be able

to move into your “search” position (as

shown on page 3) by leaning forward

very slightly and raising your arm (still

straight) until the search coil is about 2

inches above the ground and 12 inches

in front of your foot. The search coil

should be parallel to the ground and

may have to be slightly readjusted at

this point.

SETTING UP

Padded Arm Rest

Hand Grip

Control Housing

Battery Access

Panel (in rear) Search Coil Cable

Upper Stem

Lock Nut

Lower Stem

Search Coil Cable

Strain Relief

Derlin Bolt,

Nylon Wing Nut

8-inch Waterproof ESI

Sheilded Search Coil

Figure 1. Fisher M-Scope 1212-X

Figure 2. Search Position

1. ON/OFF - TRASH REJECTION CONTROL: Power

is Turned off at the full counter clockwise “OFF”

position. All metals are detected when turned

on to zero. Most small pieces of metal trash are

rejected at the maximum level of ten. Most

ground minerals are ignored at all settings.

2. STEREO HEADPHONE JACK: Located on the right

side of the control panel, this jack accepts most

stereo and mono headphones with 1/4” diameter

plugs. When used, the speaker is automatically

disconnected. A headphone can be very helpful

when hunting in noisy areas or detecting faint

signal on small, deep targets. CAUTION: Since the

1212-X has a ﬁxed volume setting (loud), always

use headphones with individual volume controls

adjusted to a comfortable level. Also, If you use a

stereo headphone, make sure the stereo/mono

switch is in the “stereo” position.

CONTROL FUNCTIONS

SPEAKER

GRILL 21

Figure 3. Control Panel. One knob does it all!

DISCRIMINATION POINTS

By adjusting the TRASH REJECTION control you will be able

to reject (or “discriminate”) small pieces of metallic trash

and ground minerals while detecting valuable targets. The

lowest setting at which an object is rejected is referred to as

the object’s “discrimination point.” Discrimination points are

determined by such factors as size, shape, depth, type of metal

and ground mineralization.

Typical 1212-X audio responses over 1 inch deep targets with

search coil sweeping 2 to 3 inches above ground.

Note that the terms “discrimination” and “trash rejection” are

used interchangeably.

1. Scatter some sample targets such as coins, pull

tabs and small pieces of foil on the ground 1 to 2

feet apart.

2. Turn the TRASH REJECTION control to zero.

3. Hold the search coil about 2 inches above and

parallel to the ground. Move it slowly over the

samples and note the sharp loud response as you

pass over each one. Keep in mind that the 1212-X

is a motion detector and responds only when the

search coil (or the target) is moving.

4. Increase the TRASH REJECTION control to a

setting of 3 and again pass over the targets.

Repeat this process at settings 4, 5, 6 and so on

to 10. You will note that as you increase the level

of trash rejection, the 1212-X will reject some

targets and continue to respond to others. You

have now determined the discrimination points for

the rejected objects. For example, the small nail

discrimination point may be at 4 and the pull tab

discrimination at 6.

5. The 1212-X will remain silent when some objects

are rejected, however, other objects may “snap,

crackle and pop” as they are rejected. This is a

perfectly normal response indicating that the

powerful discrimination circuitry is doing its job.

6. Large pieces of trash such as beer cans or jar

lids may sound like a good target no matter what

you do. With a little practice, however, you will be

able to tell the difference between a large target

and a small coin-sized object.

7. Figure 4 shows some different responses you

may expect at different levels of discrimination.

Note that as you increase the discrimination level,

you progressively eliminate more targets including

some good ones, such as nickels and gold rings.

NOTE:

The discriination levels shown are typical values only and may

vary from detector to detector.

Figure 4. Typical 1212-X audio responses over 1-inch deep targets with search coil

sweeping 2 to 3 inches above ground.

DISCRIMINATION POINTS

1. Decide how much trash rejection you want to

use.

a. In relatively non-trashy soil you may wish to search

at zero trash rejection. In this manner, your 1212-X is

at its most sensitive and will detect all metal targets

within its range. Once an object is detected, you

can increase the trash rejection level for further

identiﬁcation.

b. In trashy areas, it is generally easier to search

at a higher level of trash rejection (at the pull tab

discrimination point for example). This way you will

detect mostly good targets and can lower the

rejection level for pinpointing (zero trash rejection

will produce the strongest signal over small or deep

targets).

2. Search slowly and systematically, sweeping in a

tight semicircle.

3. Keep the coil parallel to, and as close to the

ground as practical. If you’re hunting on a lawn, you

can set the coil right on the grass and search.

4. Overlap your sweeps at least 50%.

5. Search in a methodical manner. Pay close

attention to where you’re going and where you’ve

been.

6. Keep the search coil moving at a comfortable

rate.

SEARCHING

Figure 5. Search Pattern.

When the stem is properly

adjusted, the 1212-X is balanced

for sweeping in a tight semi-circle.

Always overlap your sweeps at

least 50%.

SEARCHING

NOTE:

Other motion detectors may require a fast sweep speed for

maximum sensitivity. If you try that with your

1212-X, you’ll actually lose sensitivity.

When the stem length is properly adjusted, the 1212-X is balanced

for sweeping in a tight semicircle. Always overlap your sweeps at

least 50%.

Figure 6. Keep the search

coil parallel and close to

the ground at all times.

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